It is well known that bistable spatially-extended systems can exhibit dynamics in which two domains with propagating fronts between them are formed in space. Such fronts occur frequently in chemistry, for instance, in the Schlögl model [1]}, [2]}, [3]} developed to explain an autocatalytic reaction mechanism, as well as in various other fields, such as electronics [4]} or flame propagation theory [5]}, to name just a few. Similar processes associated with domain expansion and called 'coarsening' are studied in the context of physics of liquid crystals [6]}, magnetism [7]}, [8]}, [9]}, [10]}, physics and chemistry of materials [11]}, [12]}, [13]}, [14]}, laser physics [15]}, [16]}, [17]}, electronics [18]}, and animal population statistics [19]}. It should be noted that besides bistable spatially-extended systems [7]}, such effects have been observed for time-delay models [15]}, [16]}, [18]}, [24]}.
